Illustration by Alex Castro / The VergeI’m not going to lie: it s***s that Disney Plus is going to increase the price of its ad-free plan next month. But today, Disney softened the blow somewhat. First, the company introduced a new ad-free Disney Plus and Hulu plan for $19.99 per month, which is about $12 cheaper than buying both separately. And now — even better — Disney’s offering a good Disney Plus deal.Through September 20th, new and eligible returning subscribers can get three months of Disney Plus (with ads) for $1.99 per month instead of $7.99 a month. Altogether, that’s $18 in savings, which is kind of like getting two months free. Again, though, the deal just applies to the ad-supported tier — which isn’t increasing in price. Still, it’s a good deal, even if you…